Electric bell



March 27, 1928. 1,664,107

w. P. HENDRY ELECTRIC BELL Filed Sept. 12. 1924 INVENTOR Patented Mar. 27, 1928.

WILLIAM F. HENDRY, OF OSSINING, NEW YORK, ASSIGNOR TO MANHATTAN ELEC- V, 1,664,10 7 PATENT OFFICE.

TRICAL SUPPLY COMPANY, INCORPORATED, OF NEW YORK, 'N. Y., A CORPORATION OF MASSACHUSETTS.

ELECTRIC BELL.

Application filed September 12, 1924. Serial 115,737,353;

This invention relates to improvementsin electric bells.

The object ofthe present invention is to provide a simple and inexpensive and yet efficient bell structure.

. The invention will be more clearly undersuch as fish paper. Binding posts 2 are car-;

ried in the two lower corners of panel 1. The gong 8 is riveted at 4 to the upper end of a mounting bracket consisting of a strip of material 5 which is fastened to the panel 1 by means-of fourears Gintegrallyformed with the bracket and projecting through. suitable perforations in the panel. The cars are bent over to clamp the bracket 5 in place. Two fingers 7 and 8 struck up from that part of bracket 5 which overlies the panel 1 serve frictionally to hold a cover 9 adapted to enclose the electrical parts of the bell. The upper end of the bracket 5 is bent back to hold the gong 3 in a plane above the panel 1. The lower part of the bracket 5 has an arm 10 bent up at right angles and an opposite arm 11 also bent up at right angles, the two arms being staggered with respect to each other.

A coil of electrical wire 12 is held on an iron core 13 between spool heads 14 and 15 of insulating material. One end of the core 13 projects through perforation 16 in the arm 11 and is frictionally held therein. Preferably, the core 18 is mounted on the arm 11 by two successive drawing operations which force the metal around the perforation 16 into a collar 17 that snugly fits around the end of the core 13. This method of mounting magnet structures is described and claimed in my copending application Serial No. 726,181, filed July 15, 1924:. As clearly shown in Fig. 3, the spool heads 14L and 15, or at least one of them, are large enough to rest on the bracket 5, affording thus additional support for the magnet.

The other arm 10 carries the armature 18 of the magnet. To one end of the armature 18 is riveted a thin steel plate 19 which is in turn mounted on the arm 10' by means of two rivets. A slight gap separates the lower end of armature 18 from the arm 10, so as to permit vibration of the armature. The upper end of thearmature 18 is elongated into a rod, the end of which is formed into the shape of a cup 21, acting-asa clapper. The-rod '20 is slightly bent so that hammer 21 comes in contact with the edge of the bell. The armature carries a contact point 22 cooperating with a. contact point 23 provided, on a leaf spring 24. One end of the leaf spring 2& is free and its other end is bent in U-shape and riveted at 25 to the spool head 15.

One end of the coil 12 is brought out through an aperture 26 in the spool head 15 and is connected through wire 27 to the spring 24 at 25. .The bracket 5 is connected to one of the binding posts 2 by meansof a conductor 40 provided below the. panel 1. The other binding post 2 isconnected with the otherend of the coil 12 through another wire 41 located below the panel 1. When a battery is connected across the binding posts 2, then the magnet core 13 becomes energized, attracts the armature 18, interrupting thus its own circuit in the contacts 22 and 23. The making-and breaking of the circuit continues while the battery remains connected across the terminals 2.

It will be noted that the bracket 5 with lugs 6, 7, S andarms 10 and 11, is made of a single piece of metal which serves also to carry the gong As shown in Fig. 5, the end of bracket 5, instead of being riveted or otherwise attached to a separate gong 3, mayform a unitary structure therewith. If the gong 3 weresupported around its edge by the bracketv 5, then its tone would not be clear. In order. to avoid this, twonotches 30 and 31 are cut in the gong 3 from its rim to its center adjacent to the two points where the gong continues in the bracket 5, whereby a gong structure is obtained which is supported at its center as is the case with the gongs illustrated in Figs. 1 and 2. That part of bracket 5 which lies between the rim and center of gong 3 is preferably curved in conformity with the shape of the gong.

A further important feature is the forming of the armature 18 and the clapper 2021 of an integral piece of metal, the

spring cut-out being provided in the form of the leaf spring '24: attached to the spool head.

" tegral with said armature, and a leaf spring- An efiieient bell structure is obtained with a few castor stamped parts which may be readily assembled, owing to the absencevof a large number of riveting or similar operations customary with electric bells.

What I claim is:

1. In combination, a magnet having a spool-head of insulating material, an armature for said magnet, a contact point in- 'oneend of which is frictionally held inone (of said arms, and'the other end of which serves as a pole piece, a coil and two spool heads of insulating material on said core, thelower edges'of said spool heads resting on said bracket and serving as a support for' said core, an, armature for said magnet mounted on the other one of said arms, a contact pointon said armature, and a leaf spring carrying a contact point cooperating with the contact on the armature, one end bracket, means to clamp the bracket on said a panel, two arms integral with the bracket and bent up on opposite sides thereof in staggered relation with each other, a magnet core, one end of which is frictionally held in one of said arms, and the other end of which serves as a polepiece, a coil and two spool heads of insulating material on said core, the lower edges of said spool heads resting on said bracket and serving as a support for said core, an armature for said magnet mounted on the other one of said arms, a contact point on said armature, aleaf spring having one end riveted to one of said spool heads, a contact point near the free end of said spring cooperating-with the contact on the armature, an electrical connection from one end'of said coil to said spring, aneeleca trical connection from the other end of said coil to one of said binding posts, and an electrical connection from the other one of said binding posts, and an electrical connection from the other one of saidbindin posts to said bracket.

In testimony whereof, I have signed my name to this specification, this 4th day of September, 1924, I

WILLIAM F. HENDRY, 

